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| SILVA,BRUNO GUSMÃO; LEMOS FILHO,JOSÉ PIRES DE. |
| O presente trabalho objetivou avaliar as relações hídricas em função da demanda evaporativa e da densidade da madeira em Swietenia macrophylla King, Joannesia princeps Vell., Inga edulis Mart., Licania tomentosa (Benth.) Fritsch e Centrolobium tomentosum Guill. ex Benth. O potencial hídrico foi determinado com uma câmara de pressão e a condutância estomática, com porômetro de difusão na estação chuvosa, na estação seca e nas situações transicionais. J. princeps foi a espécie que apresentou maiores valores de potencial hídrico no "predawn" (psiPD > - 0,25 Mpa), e I. edulis os menores valores (psiPD = - 1,5 MPa). J. princeps apresentou maiores valores de potencial hídrico durante o dia (psiMD > - 1,5 MPa), e os menores valores foram observados em S.... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Water potential; Conductance; Vapour pressure deficit; Wood density. |
| Ano: 2001 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-84042001000500006 |
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| BRANCO,LUIS HENRIQUE Z.; NECCHI JÚNIOR,ORLANDO; BRANCO,CIRO CESAR Z.. |
| A hundred seventy two stream reaches from six distinct natural regions (parts of biomes or geological areas) in São Paulo State (Atlantic Rainforest, Cerrado, Hard Water regions, Northwest region, Subtropical Rainforest, and Tropical Rainforest) were searched for the most representative macroscopic Cyanophyceae of phytobenthic communities. Selected ecological parameters were analyzed in each stream segment: conductance, current velocity, oxygen saturation, pH, turbidity, and water temperature. Algal abundance was evaluated as percentage cover. Thirthy four cyanophyte taxa were identified and Phormidium retzii was the most widespread species throughout the State, occurring in all studied regions, except in hard water areas, and was negatively correlated to... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Cyanophyceae; Ecological distribution; Conductance; Streams; Brazil. |
| Ano: 2001 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-84042001000100011 |
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| Sgavioli,S; Matos Júnior,JB; Borges,LL; Praes,MFFM; Morita,VS; Zanirato,GL; Garcia,RG; Boleli,IC. |
| Dose-dependent positive effects on hatchability and hatchling weight have been attributed to ascorbic acid (AA) when eggs were submitted or not to intermittent heat stress during incubation. Fertile breeder (Cobb(r)) eggs were used to determine if the pre-incubation injection of AA in ovo affects the incubation and hatchling quality of egg incubated under thermoneutral or intermittent heat stress conditions. Eggs were not injected or injected with 0, 2,4, or 6% AA/100µL water and incubated at continuous thermoneutral (37.5ºC) or hot (39.0ºC) temperature. Eggshell temperature (EST) increased in the second half of the incubation period in all experimental groups. The EST of non-injected eggs and of those injected with water was higher when incubated at 39°C... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Conductance; Hatchability; Egg mass loss; Hatchling weight; Eggshell temperature. |
| Ano: 2015 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-635X2015000200181 |
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| Sgavioli,S; Santos,ET; Domingues,CHF; Quadros,TCO; Castiblanco,DMC; Andrade-Garcia,GM; Amoroso,L; Nääs,IA; Garcia,RG; Baraldi-Artoni,SM. |
| ABSTRACT Adequate environmental temperature control is essential for incubation efficiency. Layer breeder eggs (n=360) were weighed and distributed in a completely randomized experimental design with two treatments, consisting of two incubation temperatures (T1=37.5 °C, control; and T2=39.0 °C, hot), with two incubators per temperature, and 90 eggs per incubator, totaling 360 eggs. Hatchability, embryo mortality, and chick cloacal and body surface temperatures were not affected by incubation temperature. Eggs incubated at the hot temperature presented greater egg mass loss and higher eggshell conductance than those incubated at the control temperature. Layer chicks derived from eggs incubated at control temperature showed greater absolute weight, yolk-free... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Body weight; Cloacal temperature; Conductance; Hatchability; Loss of mass. |
| Ano: 2016 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-635X2016000600041 |
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| Oliveira, Ademir Kleber Morbeck; Universidade Anhanguera; Gualtieri, Sônia Cristina Juliano de; Universidade Federal de São Carlos; Bocchese, Ricardo Anghinoni; Universidade Anhanguera. |
| To evaluate the effects of hydric stress on CO2 and H2O exchange, five-month-old Tabebuia aurea seedlings cultivated in planting bags were subjected to hydric stress by suppressing irrigation for 21 days. After 14 days without irrigation, the rates of transpiration, stomatal conductance and net photosynthesis in leaves were zero, while the hydric potential of leaves reached -2.4 MPa. After this point, daily irrigation was resumed, and the values of the measured variables recovered to initial levels after 96 hours (transpiration rate from 3.2 to 3.5 mmol m-2 s-1; stomatal conductance rate from 0.32 to 0.35 mol m-2 s-1 and photosynthesis rate from 8.0 to 9.8 µmol m-2 s-1). Likewise, hydric potential values were similar to those at the beginning of... |
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Palavras-chave: 5.02.01.06-9 hydric deficit; Photosynthesis; Conductance; Tabebuia Fisiologia Florestal hydric deficit; Photosynthesis; Conductance; Tabebuia. |
| Ano: 2011 |
URL: http://periodicos.uem.br/ojs/index.php/ActaSciAgron/article/view/11254 |
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| Filgueira,Raúl Roberto; Golik,Inés Silvina; Sarli,Oliverio Guillermo; Jatimliansky,Raúl Jaime. |
| Two Argentine field grown wheat cultivars (Triticum aestivum L.), Buck Cencerro (BC) with traditional germoplasm, and Buck Pucará (BP) with Mexican germoplasm, have been investigated in order to compare anatomical and physiological characteristics of the flag leaf measured in heading (stage E59), anthesis (stage E69) and kernel water ripe (stage 71). In both cultivars, photosynthetic rate was not different for the same phenological stage, except for E71. Averages in stage E59 were higher than stages E69 and E71 for both cultivars (22.70, 18.40 and 10.40 µmol m-2 s-1 for BP and 23.82, 18.41 and 8.28 µmol m-2 s-1 for BC, respectively). Transpiration rates were higher in BP (5.0, 5.6 and 4.89 mmol m-2 s-1) than BC (3.3, 4.4 and 2.57 mmol m-2 s-1) for stages... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Specific leaf area; Mesophyll area; Carbon dioxide exchange; Transpiration; Leaf anatomy; Conductance. |
| Ano: 2003 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-84782003000400008 |
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